D - Textiles – Paper – 21 – F
Patent
D - Textiles, Paper
21
F
D21F 1/08 (2006.01) D21F 1/02 (2006.01) D21F 1/06 (2006.01) D21F 1/66 (2006.01)
Patent
CA 2301368
An apparatus and method for forming a thin fibrous mat, such as a tissue sheet, with improved edge strength is disclosed. The apparatus includes a headbox having a top, a bottom, a pair of lateral sides, a back with an inlet formed therein and a front with an outlet formed therein. A first conduit is connected to the inlet of the headbox and flow therethrough is regulated to convey a first aqueous slurry at a desired flow rate into the headbox. The first aqueous slurry has a predetermined fiber consistency. A second conduit is connected to one of the lateral sides of the headbox and a second aqueous slurry is directed therethrough into the headbox at a different flow rate than through the first conduit. The apparatus also includes a mechanism for drying or draining water from the aqueous slurry exiting the outlet to form a thin fibrous mat. The thin fibrous mat has increased strength adjacent to an edge located downstream from the second conduit. The method includes the steps of introducing a first aqueous slurry to the inlet of the headbox and introducing a second aqueous slurry to at least one side of the headbox to form a fibrous mat with improved edge strength and better basis weight uniformity.
Beuther Paul Douglas
Urquhart Richard Martin
Borden Ladner Gervais Llp
Kimberly-Clark Worldwide Inc.
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